To insert the Input Plane and set the excitation, perform the following procedures.
Inserting the Input Plane
|1||From the Draw menu, select Vertical Input Plane.
– The Vertical Input Plane is in the x-y plane for 3D.
– The Horizontal Input Plane is only functional with a 2D simulation.
– Multiple Input Planes are only allowed in a 2D simulation.
|2||Click in the layout window at the position where you want to insert the Input Plane.
A red line that presents the input plane appears in the layout window.
Figure 19: Input Plane
|3||To set up the Input Plane properties, double-click the red line (Input Plane) in the layout window.
The Input Field Properties dialog box appears.
Figure 20: Input Field Properties dialog box
|4||Set the time domain Input Plane information.
a. Select Gaussian Modulated Continuous Wave.
The Gaussian Modulated CW tab appears.
b. Wavelength (µm): 1.4
– For Continuous Wave, Wavelength is the single wavelength to be simulated.
– For Gaussian Modulated Continuous Wave, Wavelength is the carrier
wavelength (center wavelength) for the pulse.
|5||Click the Gaussian Modulated CW tab.
The time domain pulse graphics appear.
Type the following values for the time domain input plane.
Time offset (sec.): 4.5e-14
Half width (sec.): 1.2e-14
Figure 21: Gaussian Modulated CW tab
– Both the time domain wave and frequency domain wave for the Input
– The Frequency domain information is obtained by FFT from the time domain series.
– Right clicking on the graph allows you to select the graph tools.
– Time offset controls the time domain beam center.
– Half width controls the beam size and bandwidth.
|7||To set up the general information (transverse field distribution) for the Input Plane, click the General tab.
a. Input Field Transverse: Modal
b. Z Position (µm): 0.63
c. Plane Geometry: Positive direction
d. Label: InputPlane1 (default)
Figure 22: General tab
Note: Positive Direction means the that the Input Plane is excited to the
positive z-direction. Negative Direction means that the Input Plane is excited
to the negative z-direction.
|8||To solve the 3D transverse mode, click the 3D Transverse tab.|
Figure 23: 3D Transverse tab
|9||Type the following Input Amplitude value (V/m): 1.0|
|10||Click Find Modes.
The Waveguide selection window appears.
Figure 24: Waveguide selection dialog box
|11||Select the Linear Waveguide check box, select ADI-BPM Method.|
|12||To open the mode solver, click Calculate Mode.
The Globe Data: ADI Method dialog box appears.
Figure 25: Global Data: ADI Method dialog box
|13||Set the following:
Mode (initial excitation): Full Vector, Along Y
Wavelength (µm): 1.4 (the same as the input wavelength by default,
Number of Modes: 1
|14||Click the Settings tab and set Boundary Condition: TBC|
|15||To solve the mode, click Calc. Mode.
The 3D Mode Solver opens.
Figure 26: 3D Mode Solver
– The 3D Mode Solver can take a while to start up.
– It can take several minutes to solve the mode.
– A message appears to advise you if no mode has been found.
|16||After solving the mode, click the field (Ex, Ey) tab to view the field pattern.|
Figure 27: Major component Ey tab
|17||To return to the Input Field Properties dialog box, close the 3D Mode Solver.|
|18||To complete the Input Plane setup, click OK.|
Saving the layout
To save the layout you have created, perform the following procedure.
Note: Do not save your project over the sample file provided.
|1||From the File menu, select Save As.
The SaveAs dialog box appears.
|2||In the sample folder, enter the name of the file and click Save.
The new sample file is saved in the sample folder.
Note: .fdt is the file extension generated by OptiFDTD_Designer.